I will alert our HQ regarding your trip.
As you likely know from all your research, there are no Glencolmkille RC parish records online and whatever records exist starting 1880 or later are held at the local level.
I looked at the 1857 Griffiths Valuation head of household listing for Glencolumbkille civil parish and the only McGinley listed in Meenaneary was Charles McGinley.
This Charles McGinley died in 1874 see fourth record and presumably the Patrick McGinley shown as the informant was the 1824 Patrick McGinley. Likely Charles was the older brother to Patrick McGinley and Patrick took over the lease. Not sure what happened to the widow.
The 1824 Patrick McGinley died in 1917 and was shown as 98 years old.